Revolving steady-rest.



W. $UHELLENBAUH" REVOLVING STEADY REST. APPLICATION FILED JAH.13, 191s.

Patented July a, 19m

ii in? WILLIAM SCI-IELLENBAGH, OF HAR'BWELL, OH'IG, ASSIGINOR TO THELODGE 8c SHIRLEY MACHINE TOOL COMPANY, h CINCINNATI; OHIO, A COOEATIONOF OHIO.

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Specification of Letters Patent.

Patenteddtuly e, are.

Application filedfianunry 13, 1ht&. serial No. 74L73t.

To all whom it may concern."

Be it known that I, WILnmM ScHnLnEN- more, a citizen of the United:States, residing at Hartwell, in the county of Hamilton and State ofOhio, have invented certain new and useful Improvements in RevolvingSteady-Rests, of which the following is a specification.

This invention deals with improvements in steady-rests and it proposesarr arrangement facilitating the bracing of work rotating bet-weencenters to promote eficiency and accuracy in turning the same.

One object within the contemplation of the invent-ion is to renderavailable a simple contrivance for positively maintaining the normalalinement of intermediate parts of: a

relatively long piece of work, such as a crankshaft, while the same isbeing tooled 2b} as in a lathe Another object is to create an:instrumentality comprising a member capable of being gripped toanintermediate part of thework, (irrespective of whether such part isunfinished or rot-ates eccentrically with the lathe-centers) and somounted that it will brace the w ork againstspringing under the pressureof the lathe-tool, and do so in all radial directions so that in nopositioniof its rotation willthe thrust of the tool be inade quatelyresisted.

Another object is to devise a means that may be speedily applied to thework. to reinforce the same, while yet permitting rotation, but withoutgiving rise to a material amount of rotary friction, even under heavycuts of the cutting tool.

@ther objects will be in part obviousl rom. the accompanying drawingsand will be in part indicated in the following description.

in order that this invention may be so fully revealed as to enableothers diversely to embody it under Widely difierent applica tions,drawings exemplifying a typical embodiment thereof have been appended asa part of this disclosure, and in. such drawings like characters ofreference indicate corresponding parts throughout the various views, ofwhich Figure l is an elevation partly in section looking along thecenter-line of a lathe from the tail-stock, showing the adapter swunginto a horizontal position and secured to a crank-pin as well as to acheck of a dil crank-shaft. Fl 2 is a front view )artlv 1:: a l l inelevation and partly in section, showing the clamp-screws mounted on:the adapter taking hold of a pin and a cheek of a crank-shaft; and alsoshowing details in the construction and mounting of the various no;

parts Fig. 3 is an: isolated-'- perspective of the adapter and itsparts.-

Continuing now byway of a more detaileddescription, it may benoted thatthisinvention preferably combines three major @5- elements, (A) theannular standard providing bearing elements concentrically distancedfrom the lathe axis, (B) the spider fireely journaled in said standardand open in its central region to accommodate themworli', and C) theadapter having a clamp capable of initially seizing the work while inany unrestrained or haphazard radial relation with the spider, andhaving means v for thereupon firmly securing it in any re 1 sultantposition to the spider to maintain the work against springing whiletooling,

The annular standard A is for the purpose on mounting this deviceaccurately in concentric relation with the center-line of a W lathe,and: for providing a free-turning bearing for the work clamping andbracing instrumentalities; It comprises a hoop like portion 1 preferablycast with a base portion 2 having a lliteral extension 3 for the purposeof better securing the same to a lathe-bed to prevent side-sway. The baeportion 2 may provide a V shaped: channel 4 and a surface 5 for mountingit on the guides of a lathe-bed, it being understood that these featuresare purely conventional and will vary in accordance with the differentpatterns of lathes. For the purpose of facilitating the attachment ofthe base of the standard to the lathe'bed, an underlying clamp block 6,arranged to straddle the un der side of the lathe bed, is guided by thepin 7 projecting from the part 8 that extends downwardly between thefro-nt and rear walls of! the lathe-bed The bolt 9 attaches thisclamp-block 6 to a pull-block 10 having an aperture 11 through whichpasses the eccentric or cam bolt 12 that is journaled in the walls ofthe base 2, so that, by turning the bolt- 12, the parts 9 and 10 will beput under tension to draw the straddle clamp-bar 6 against the underside of the V 'lathebed and thus firmly clamp the base of the standardonto the same. This device may be operated very quickly andconveniently. The aforesaid .base is so proportioned with relation tothe annular part 1 of the standard that when it is clamped in place onthe lathe bed, the part 1 will be brought exactly into co-axialalinement with the lathe-centers. For the purposes of lightness, thisannular portion 1 may be cast with an interior circumferential channel,and it may be reinforced by suitable ribs 13. Preferably, this inventionproposes suitable anti-friction elements between the standard and ahoop-like spider that is journaled therein, and to that end, a series ofhardenedrollers 14 are positioned between the said walls of the annularportion 1 and are equi-spaced circumferentially, and are all arranged atexactly the same distance from the center-line O of the lathe, by meansof the hardened journal pins 15. These rollers are utilized, not onlyfor the purpose of maintaining the rotative ring or spider in absoluteconcentricity' with the center-line of the lathe, but for also relievingit of the greatest possible amount of friction and furthermore forholding said ring in the annular standard and preventing it from havingany lateral movement relative thereto. This last-mentioned capacity isin this in stance attained by making the. rollers 14: project inwardlya. slight distance from the inner periphery of the annular standard, andcausing them to enter into a snug fit within the circumferential grooveprovided by the rotating spider or ring, as will now be explained.

The rotary spider B is the element that intervenes between thestationary standard and the member that clamps directly to the work andwhich enables such member (in-- dependently of its absolute position inspace) to be restrained to a rotation about thecenter line of the lathe.This so-called spider, preferably, has its central portion largely orentirely open orcut away so as to enable it to entirely clear the partsof a crank-shaft when moved laterally. The form shown has an annular orring-like shape and is accurately journaled in the standard by means ofthe rollers 14 as aforesaid, and in point of detail in construction, itis preferably built up of two rings 16 and 17 The front ring 17 providesa circumferential track 18 for the periphery of a roller 14, and it alsoprovides a flange 19 furnishing a side-face 20 adapted to bear againstthe side of the said roller and thus limit the lateral movement of thering 17. The complementary ring 16 is attached to the ring 17 by meansof bolts 21 and it corresponds in proportion to the flange 19 andprovides the lateral annular bearing face 22 to limit the movement ofthe rin in the other direction. When the standar and its component partshave been assembled, the

ring 17 is slipped into place and the complementary back ring 16 is thensecured to its companion by means of a bolt 21, and it will thus beperceived that the anti-friction roller elements 1i not only supportthis rotary ring or spider by constituting an efficient anti-frictionbearing, but also that these rollers maintain this spider in axialcoincidence with the lathe centers, as well as preventing any side playthereof. In other words, they alone, and exclusively, determine theabsolute position of the spider. This spider is shown constructed so asto be relatively narrow, like the annular stand ard, so as to consumebut little room laterally and permit its use in confined spaces. Themeans instrumental in enabling the work to be clamped indirectly to thisspider.

in a positive rigid manner, will now be explained.

The clamp adapter C is a member intervening between the spider and thework and is capable of being securely attached to the work, while quitefree of restraint by the spider, and of being thereupon secured to thespider in whatever position or relation therewith may have beenpredetermined in consequence of its attachment to the work. Thisself-adapting capacity has been provided so as to permit work that isirregular or eccentrically located to be clamped and held on centerswithout trouble. This element is therefore in the nature of anormalizing or compromising interponent that establishes a definitefixed relation between the work and the spider, without howeverrequiring the work to be twisted or strained into any abnormal position.In this instance the adapter providesa radius bar 23 having at itsextremities slots 24 that are adapted to receive the shanks of the bolts25, whereby it is freely adjustably secured to the spider. This device,being primarily constructed for steadying crank-shafts while they arebeing finished, is therefore so designed that it may take hold of ajournal of a crank-shaft, or of a pin of a crankshaft, as well as thecheek of the same. In putting this into practice, the radius bar 23provides a clamp socket 25 for a main journal of the crank-shaft, aswell as a similar clamp-socket 26 located off-center for a pin." Thesesockets are arranged at one side of a diameter line of the spider, andthe crank-pin or journal as the case may be, is clamped into this socketby clamp screws mounted on a plate 27 that is detachably secured to theradius bar 23' by means of the studs 28. This plate provides aclamp-screw 29 directly opposite the clamp-socket 25, and similarly itprovides a screw-hole 30 for a clamp-screw opposite the crank-pin socket26. By this arrangement, either acrank-pin or a journal may be tightlyclamped to the radius-bar 23. Preferably, however, means are alsoproenemas vided for clamping a check of a crankshaft so as better toprevent the pin or journal from slipping in its socket, and otherwise toinsure a more efiective grip of the crank-shaft. To that end, squareheaded dogs 31 may be driven into aperture's'32 in the side of theradiusbar 23 and keyed plate 27 has an odset portion or wing 35- 7 thathas apertures 36 in alinement with the apertures 33 in the dogs andmount clampscrews 37. It will be perceived that the clamp-screws for thepins are in a different plane than the clamp screws forthe cheeks sothat the latter may be clamped simultaneously with a pin or journal, asthe case may be. This construction for the adapter is light and enablesthe same to be handled with facility. When it is desired to attach thesame to the work, the standard and spider carried thereby may be broughtinto place, with the adapter loose, and the latter is first firmlyclamped to the work and thereafter tightly affixed to the spider, thuspreventing the normal status of the work from being disturbed by adeflection of the work under the pressure of the tool.

It will thus be seen that this invention is well adapted to achieve theobjects aforesaid and that it possesses many advan tageous capacitiesmaking for rapidity as well as accuracy in the commercia produc tion ofcrank-shafts and the like. Any intermediate point of a crankshaft, suchas a in or main journal (whether rough or finished), may be rigidlymaintained in its normal position by positively resistin all warping orspringing strains resulting rom the pressure of the cutting tool, andvery little trouble-is occasioned and but few manipulations are requiredin setting up and accurately adjusting the apparatus.

In operation, all side pressures are reslsted by the anti-frictionrollers intervening between the spider and the standard; so that thereis no tendency to chatter or create undue friction in taking heavy cuts,'as is the case with ordinary rests which maintain a stationary jaw insliding contact with some intermediate point of the work. Even thou hthe gripped portion of the work shou d be ofi-center, therubbing orsliding contact is distributed widely on the smooth and well-finishedperiphery of the spider thus promoting a smooth and free rotation andavoiding the local and rough contacts inhering to ordinary center-rests.

Without further elaboration, the foregoing will so fully reveal the gistof this invention that others may readily apply current knowledge inadapting it for various uses and preferences, without omitting featuresthat, from the aspect of the prior art, fairly constitute essentialcharacteristics thereof, and therefore such adaptations should and areintended to be comprehended within the range of equivalency of thefollowing claims 7 Having thus fully revealed my invention, I claim asnew and desire to secure by Letters Patent of the United States 1. Asteady-rest "of the nature disclosed combining a narrow annular standardhaving a base portion for'mounting it concentrically with and betweenthe centers of a lathe, a narrow spider journaled in and CH- cumscribedby said standard and having a central opening of relative largediameter, a member adapted to oe clamped to an intermediate part of thework, and means enabling said member to be finally fixed to said spiderin the position predetermined by its attachment to the work.

2. .A crank-shaft steady-rest of the nature disclosed combining a narrowstandard having an enlarged annular opening and a base portion formounting it with said opening concentric with the centers of a lathe, anar row annular spider concentrically arranged within said opening,rollers intervening between the periphery of said spider and that ofsaid opening and operating in grooves in one of said parts to determineits relation to the other, a member adapted to be clamped to anintermediate part of the work between the lathe centers, and meansenabling said member to be adjustably fixed to said spider in anyposition predetermined by its attachment to the work.

3. A steady-rest of the nature disclosed combining an annular standardadapted to be mounted in concentric relation with and between thecenters of a lathe, a spider providing a large central opening andrevolubly journaled in said standard, and a member having a clam -socketfor gripping a pin of a crank-she t and also having means for grippingthe cheek thereof, and adapted to be adjustably secured to said spiderto fix said socket in any predetermined axial relation with said spider.

4. A steady-rest of the nature disclosed combining a narrow annularstandard having a base portion for mpunting it concentrically with andbetween the centers of a lathe, a narrow spider in and circumscribed bysaid standard and having a central opening of relative large diameter, amember adapted to be clamped to the cheek of a crank-shaft, and meansenabling said member to be finally fixed to said spider in the positionredetermined by its attachment to said cran -shaft.

5. A crank-shaft steady-rest of the nature disclosed combining a narrowstandard having an enlarged annular opening and a base portion formounting it with said opening concentric With the centers of a lathe, anarrow annular spider concentrically arranged within said opening,rollers intervening be- 5 tween the periphery of said spider and that ofsaid opening and operating in grooves in one of said parts to determineits relation to the other, a member adapted to be clamped to the cheekof a crank-shaft 10 mounted between the lathe centers, and

means 7 enabling said member to be adjustably fixed to said spider inany position predetermined by its attachment to the Work.

In testimony whereof, I have hereunto set my hand.

WILLIAM SCHELLENBACH.

Witnesses OLIVER B. KAISER, CLARENCE B. FOSTER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

